453870domain: NAppears in sequencesSmallest integer m > n such that both n*m and (n+1)*(m+1) are squares.at n=30A212651Numbers k such that core(k+1) = core(k)+1 and k is not squarefree, where core(k) = A007913(k).at n=13A260198a(n) = n * (4*n + 3)^2.at n=30A322675